Thread Content
What are the uses of black corundum? Next, let the editor from Chikka Shinai Material give you a detailed introduction! 1. Grinding and polishing: Medium- and fine-grit black corundum sand was initially used primarily for sandblasting, grinding, and polishing of various materials such as stainless steel, ordinary steel, bamboo, wood, and glass, especially for the surface treatment of stainless steel. Polishing stainless steel workpieces with black corundum does not easily cause damage to the surface of the workpieces. After polishing, the surface takes on a bright, uniform blue-green color typical of stainless steel. In contrast, using brown corundum, white corundum, or similar materials can lead to damage to the workpiece’s surface, resulting in darker areas and significant color differences. Today, black corundum is still widely used in the grinding and polishing industry. 2. Installation of wear-resistant and anti-slip surfaces and floors: Black corundum segment sand is used for creating wear-resistant and anti-slip surfaces on bridges and in parking lots, especially in areas with sharp curves and steep slopes. It boasts excellent wear-resistant and anti-slip properties, as well as a uniform matte black color both on the outside and inside. It is particularly suitable for use in constructing road surfaces, bridge decks, and floors. Compared to materials that use brown corundum or silicon carbide aggregates, it offers a very high cost-performance ratio. It has been in regular use for nearly a decade in Europe, **, ** regions, as well as in the economically developed areas of the country. In China, it is commonly applied by bonding one or more layers of resin onto a cement base; abroad, asphalt is used as the binder while corundum is used as the aggregate to pave road surfaces, bridge decks, or floor surfaces. 3. Resin cutting discs: Over the past decade, internationally renowned abrasive and grinding tool companies have operated more than a dozen factories around the world, while several large domestic manufacturers of resin grinding tools have incorporated 30%-50% of corundum black into high-hardness, wear-resistant materials such as brown corundum or calcined brown corundum to create composite abrasives, which are used in the production of resin grinding wheels, resin cutting discs, resin grinding plates, and resin ultra-thin sheets. The use of composite abrasives can enhance the sharpness of cutting inserts, improve the smoothness of the cut surfaces, result in less discoloration, allow for smoother operation of the cutting machine, and offer excellent cost-performance ratios; as a result, it has become the main application area for corundum products. When manufacturing resin tools using black corundum composite abrasives, the original particle size distribution of the abrasives is generally maintained, with either no change or a slight reduction in the coarse particle sizes. One or several finer particle sizes are replaced by 30-50% black corundum as part of this composite mixture. Adding 5% of finer particle sizes (such as #60+70, #70) of black corundum to the resin cutting tool can significantly improve surface smoothness and enhance durability. 4. Production of bonded abrasives As early as six years ago, the internationally renowned abrasive and grinding tools company Saint-Gobain was the first to use black corundum in the production of bonded abrasives, and it has continued to use this material on a large scale ever since. The Technology R&D Center of Henan Yeda New Materials Technology Co., Ltd. converted sandpapers made from combinations of pure black corundum, pure brown corundum, black corundum, and brown corundum in various proportions into sand belts, and conducted tens of thousands of sand belt grinding tests. These tests demonstrated that sand belts made from composite abrasives containing black corundum and brown corundum are more effective at polishing stainless steel compared to sand belts made from pure black corundum or pure brown corundum. Abrasives composed of black corundum and brown corundum in appropriate proportions, when used in bonded grinding tools, not only **reduce raw material costs**, but also improve the performance of the products for processing various materials, resulting in better grinding effects and a higher cost-performance ratio. In the past two years, an increasing number of domestic manufacturers of bonded abrasives have also recognized the unique properties of black corundum. They use a combination of black corundum and brown corundum to produce bonded abrasive products. In particular, those manufacturers with R&D capabilities have developed methods for combining black corundum with calcined brown corundum in appropriate proportions to create bonded abrasives that can be used for grinding wood, metals, etc. These abrasives offer better grinding results compared to those made from pure calcined brown corundum, and they provide an excellent cost-performance ratio. Several leading companies in China’s bonded abrasive industry have already achieved partial success in the research, development, and application of black corundum, which is now being used on a large scale. There are also many companies that are actively engaged in research and experimentation. It is believed that black corundum products will be able to leverage their advantages in the bonded abrasive industry, helping to create a wider range of products that better meet the various needs of the market. 5. Fabrication of fiber wheels – Fiber polishing wheels made from fine-grained pure black corundum are suitable for the grinding and polishing of various workpieces. By combining brown corundum, calcined brown corundum, and silicon carbide to create fiber wheels, it is possible to achieve both grinding and polishing functions, offering a better cost-performance ratio. The optimal proportion of these abrasives can be determined through experiments, depending on the requirements for grinding and polishing in use. 6. Other applications As our understanding of the properties of corundum deepens, its areas of application are bound to expand further. It can be used as an additive in wear-resistant and fire-resistant coatings made from fine-grained black corundum; to make polishing waxes; to create polishing blocks for free grinding; as a wear-resistant aggregate in wear-resistant and anti-slip plastic floors; to produce wear-resistant tools that can be reused multiple times using black corundum as an aggregate; for sandblasting to give denim jackets a worn appearance; in the shoe industry to add wear-resistant aggregates to the outer side of shoe soles and heels; for manufacturing unfired refractory materials; and for producing refractory linings for steelmaking furnaces, among other applications.